import React, { Component, Suspense, lazy } from 'react'
import { Link, Route } from 'react-router-dom'
// import Home from './Home/Home'
// import About from './About/About'

const Home = lazy(()=>import('./Home/Home'))
const About = lazy(()=>import('./About/About'))

export default class App extends Component {
    render() {
        return (
            <div id="root">
                <div>
                    <div className="row">
                        <div className="col-xs-offset-2 col-xs-8">
                            <div className="page-header"><h2>React Router Demo</h2></div>
                        </div>
                    </div>
                    <div className="row">
                        <div className="col-xs-2 col-xs-offset-2">
                            <div className="list-group">
                                {/* <a className="list-group-item active" href="./about.html">About</a>
                <a className="list-group-item" href="./home.html">Home</a> */}
                                <Link className="list-group-item" to="/about">About</Link>
                                <Link className="list-group-item" to="/home">Home</Link>

                            </div>
                        </div>
                        <div className="col-xs-6">
                            <div className="panel">
                                <div className="panel-body">
                                    {/* fallback：里面也可以为组件，但这组件不能设置为懒加载 */}
                                    <Suspense fallback={<h1>Loading......</h1>}>
                                        {/* 注册路由 */}
                                        <Route path="/about" component={About}></Route>
                                        <Route path="/home" component={Home}></Route>
                                    </Suspense>

                                </div>
                            </div>
                        </div>
                    </div>
                </div>
            </div>

        )
    }
}
